<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
<!-- 容器 -->
<div id="root">
    姓：<input type="text" v-model="firstname"><br>
    名：<input type="text" v-model="lastname"><br>
    {{allname()}}
</div>
<script type="text/javascript">
    new Vue({
        el: '#root',
        data:{
          firstname:'张',
          lastname:'三'
        },
        methods: {
            allname(){
                return this.firstname + this.lastname;
            }
        }
    })
</script>
</body>
</html>